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determine D,f for the given function in the indicated direction. 3. f(x, y) = cos in the direction of i = (3,-4) 4. f(x,

determine D,f for the given function in the indicated direction. 3. f(x, y) = cos in the direction of i = (3,-4) 4. f(x, y,z) =xy 4xz in the direction of v = (-1,2,0)

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